WASHINGTON (WUSA9) -- A mass casualty has been declared after a crash involving seven cars on southbound I-295 Thursday morning, DC Fire and EMS said.

The crash happened on southbound I-295 right before Nannie Helen Burroughs Ave. Two lanes are currently blocked.

Officials have declared this as a mass casualty. According to officials there may be serious injuries. Ten people were involved in the crash. Patients were transported from the scene. One patient potentially has life-threatening injuries and another has serious, officials said.

At least one car ended on top of another in the crash.

The scene has now been cleared.